JP4655031B2 - Switchgear - Google Patents

Description

  The present invention relates to an opening / closing device used in various electronic devices such as a mobile phone and a personal computer.

  In recent years, as electronic devices such as mobile phones and personal computers have become smaller and lighter, so-called foldable types, in which a movable casing is attached to a fixed casing so that it can be opened and closed, are increasing. The opening / closing device used is also required to be inexpensive and reliable in opening / closing operation.

  Such a conventional switchgear will be described with reference to FIGS.

  In these drawings, the cross-sectional views are enlarged in the radial direction to facilitate understanding of the relationship between the fixed cam and the movable cam.

  FIG. 12 is a sectional view of a conventional switchgear, and FIG. 13 is an exploded perspective view. In FIG. 12, 1 is a substantially cylindrical and metal fixing body, 2 is a fixing case, and 3 is a substantially columnar fixing shaft. Thus, a pair of groove-shaped fixed cams 4 are formed on the outer periphery of the fixed body 1, the fixed case 2 is fixed to the left end of the fixed shaft 3, and the fixed body 1 is fixed to the intermediate portion.

  Reference numeral 5 denotes a substantially ring-shaped movable metal body, and 6 is a substantially cylindrical movable case. A pair of pin-shaped movable cams 7 are formed on the inner periphery of the movable body 5 and the outer periphery is provided with an outer periphery. A pair of convex portions 5A projecting in the direction is provided, and this convex portion 5A is inserted into the groove 6A so that the movable body 5 can move in the axial direction with respect to the movable case 6 and is integrated in the rotational direction. It is formed to rotate.

  The fixed case 2 is rotatably mounted in the left end opening of the movable case 6, the fixed portion 2 </ b> A protrudes to the left, the fixed shaft 3 is inserted through the movable case 6, and the right end is the retaining ring 8. Thus, the movable case 6 is rotatably mounted on the outer surface.

  Further, 9 is a coiled spring, which is mounted in a slightly bent state between the right side surface of the movable body 5 and the inner side surface of the movable case 6, and by this spring 9, the movable body 5 is directed to the left stationary body 1. Is being energized.

  Reference numeral 10 is a substantially cylindrical and metal reversal body, 11 is a substantially ring-shaped reversal body, a reversal reversing cam 12 is provided at the right end portion of the reversal body 10, and a refraction shape is formed at the right end portion of the releasable body 11. Each of the release cams 13 is formed, and the reversing body 10 is attached to the fixed case 2 so as to be movable in the axial direction and the release body 11 is rotatable.

  Reference numeral 14 denotes a pressing body in which an uneven pressing cam 15 is formed at the right end portion, 16 denotes a winding spring, one end of the winding spring 16 being slightly twisted, one end being the releasing body 11 and the other end being the pressing body 14. While being locked, the pressing body 14 is attached to the left end of the fixed shaft 3 so as to be movable in the axial direction, and protrudes leftward from the fixed case 2 to constitute the opening / closing device 20.

  The opening / closing device 20 configured as described above is, for example, as shown in the perspective view of the mobile phone in FIG. 11, such as an operation unit 22 </ b> A having a plurality of keys on the upper surface of the fixing case 2 and a microphone. The movable case 6 is fixed to the fixed housing 22 on which the audio input unit 22B is formed, and the movable case 6 on the surface of which the display unit 23A such as an LCD and the audio output unit 23B such as a speaker are formed.

  Further, a push button 24 is mounted on the pressing body 14, and the push button 24 projects from the side surface of the fixed housing 22, and the movable housing 23 can be opened and closed with respect to the fixed housing 22 by the opening / closing device 20 as described above. The electronic device is configured by being pivotally supported by the motor.

  In the above configuration, when the movable casing 23 is closed with respect to the fixed casing 22, the opening / closing device 20 moves from the fixed cam 4 to the movable cam 7 as shown in the cam operation diagrams of FIG. 12 and FIG. Since the movable cam 7 is elastically contacted with the inclined portion on the right side of the reversing cam 12 protruding in the direction, and the movable body 5 is biased in the closing direction in the right direction by the spring 9, the movable case 6 is mounted. The casing 23 is applied with a biasing force in the closing direction, and the movable casing 23 is held in a closed state.

  When the push button 24 on the side surface of the fixed housing 22 is pressed from this closed state, the press cam 15 of the press body 14 to which the push button 24 is attached presses the release cam 13, and the release cam 13 flexes the winding spring 16. As shown in FIG. 14B, the release cam 13 is disengaged from the lower end of the reverse cam 12, so that the reverse cam 12 moves downward.

  For this reason, the movable cam 7 biased by the spring 9 rotates in the left direction by elastic contact with the left inclined portion of the fixed cam 4, and the movable body 5 is biased in the leftward opening direction. A force in the opening direction is applied to the movable casing 23 by the force.

  As shown in FIG. 14 (c), while the movable cam 7 biased by the spring 9 slides elastically on the left inclined portion of the fixed cam 4 and rotates leftward, the movable body 5 and The movable case 6 is urged in the left open direction, an open direction force is applied to the movable casing 23, and the movable casing 23 is opened at a predetermined angle, for example, about 160 degrees with respect to the fixed casing 22. Become.

  At this time, when the finger is released from the push button 24 and the pressing force to the pressing body 14 is released, the release cam 13 biased by the winding spring 16 rotates to the left, and the reversing cam 12 moves upward. Press.

  And as shown in FIG.14 (d), while the release cam 13 and the press cam 15 return to the same position as Fig.14 (a), the reversing cam 12 pressed by the release cam 13 moves upward, The reversing cam 12 also returns to the original position.

  That is, in addition to opening and closing the movable casing 23 by hand, by pressing the pressing body 14, the release cam 13 is rotated and the reversing cam 12 is moved in the vertical direction, that is, the axial direction, thereby fixing the movable cam 7. The cam 4 is configured to perform a so-called one-touch open operation in which the cam 4 is elastically slid to open the movable casing 23 with one touch.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2004-150575 A

  However, in the above conventional opening / closing device, when the reversing cam 12 moves in the axial direction, the movable cam 7 is elastically contacted only with the fixed cam 4 to obtain the force in the opening direction. A groove-shaped fixed cam 4 on which the pair of movable cams 7 on the inner periphery of the movable body 5 slides in contact with the elastic body must be formed on almost the entire circumference. There is a problem that it takes time to manufacture and becomes expensive.

  The present invention solves such a conventional problem, and an object of the present invention is to provide an opening / closing device that can be manufactured at low cost and can be opened and closed reliably.

In order to achieve the above object, the present invention is a substantially cylindrical fixed body having a fixed cam provided on the outer periphery, inner periphery or end thereof, and is disposed so as to be rotatable in the opening direction or the closing direction with respect to the fixed body. And a substantially ring-shaped movable body having a movable cam projecting on the inner periphery or outer periphery, a spring for urging the movable cam in the direction of the fixed cam, and an axially movable member. When the movable cam is elastically contacted with the reverse cam, and the movable body is biased in the closing direction by the spring. When the reversing cam moves away from the movable body, the movable cam elastically contacts the fixed cam, the movable body is urged and rotated in the opening direction, and then the movable cam is reversed. The above-mentioned movable body is in elastic contact with the cam During the predetermined angle KiHiraki direction is obtained by constituting the switchgear so as to rotate, when the reversal member is moved in the axial direction, the movable cam is elastic contact with the fixed cam, with the movable body in the opening direction After this, the movable cam rotates elastically against the reversing cam for a predetermined angle, and therefore the fixed cam is not required for the fixed body during this rotation angle, and not the entire circumference of the outer periphery. Therefore, it is possible to manufacture a fixed body relatively easily by molding or the like, and to obtain an opening / closing device that can be manufactured at low cost and has a reliable opening / closing operation. It has the effect | action that can be performed.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to realize an opening / closing device that can be manufactured at low cost and can be reliably opened and closed.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In these drawings, the cross-sectional views are enlarged in the radial direction to facilitate understanding of the relationship between the fixed cam and the movable cam.

  Further, the same reference numerals are given to the same components as those described in the background art section, and the detailed description will be simplified.

(Embodiment 1)
An embodiment of the present invention will be described using the first embodiment.

  FIG. 1 is a sectional view of a switchgear according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is an exploded perspective view of the main part, and in FIG. A pair of fixed cams 32 are formed on the outer periphery of the fixed body 31 so as to partially protrude outward.

  Reference numeral 33 denotes a metal fixed shaft, and 34 denotes a metal fixed case. A pair of concave and convex auxiliary cams 35 are formed on the outer periphery of the right end portion of the fixed case 34, and A fixed body 31 is fixed to a left end portion, and a fixed case 34 is fixed to the left end portion.

  Reference numeral 36 denotes a substantially ring-shaped metal movable body which is disposed so as to be rotatable in the opening / closing direction and movable in the axial direction with respect to the fixed body 31 and has a pair of pin-shaped movable cams on the inner periphery. 37 is formed in a protruding manner, and a pair of concave and convex auxiliary cams 38 is formed on the outer periphery of the left end portion.

  Reference numeral 39 denotes a substantially cylindrical and metal movable case. A pair of groove portions 39A are provided on the outer periphery, and a pair of convex portions 36A protruding from the outer periphery of the movable body 36 are inserted into the groove portions 39A. Is movable in the axial direction relative to the movable case 39, and is configured to rotate integrally in the rotational direction.

  Further, a fixed case 34 is rotatably mounted in the left end opening of the movable case 39, the fixed portion 34A protrudes to the left, the fixed shaft 33 is inserted through the movable case 39, and the right end is a retaining ring 40. Thus, the movable case 39 is rotatably mounted on the outer surface.

  Reference numeral 41 denotes a coil-shaped spring made of steel wire, which is mounted in a slightly bent state between the right side surface of the movable body 36 and the inner side surface of the movable case 39. By this spring 41, the movable body 36 is fixed to the left side. It is biased toward the body 31.

  Further, 42 is a substantially cylindrical and metallic reversal body, 43 is a substantially ring-shaped release body, a pair of concave and convex reversing cams 44 are provided at the right end of the reversal body 42, and a right end portion of the release body 43. Concave and convex release cams 45 are respectively formed, and the reversing bodies 42 are attached to the fixed cases 34 so as to be movable in the axial direction and the release bodies 43 are rotatable.

  Further, 46 is a pressing body having a concave and convex pressing cam 47 formed on the right end portion, 48 is a steel wire spring, and one end is on the release body 43 and the other end is on the winding spring 48 in a slightly twisted state. While being locked by the pressing body 46, the pressing body 46 is attached to the left end of the fixed shaft 33 so as to be movable in the axial direction, and protrudes leftward from the fixed case 34 to constitute the opening / closing device 50.

  In the opening / closing device 50 configured as described above, for example, as shown in the perspective view of the mobile phone in FIG. The movable case 39 is fixed to the fixed housing 22 on which the audio input unit 22B is formed, and the movable case 39 on the surface of which the display unit 23A such as an LCD and the audio output unit 23B such as a speaker are formed.

  In addition, a push button 24 is attached to the pressing body 46, and the push button 24 protrudes from the side surface of the fixed casing 22, and the movable casing 23 can be opened and closed with respect to the fixed casing 22 by the opening / closing device 50 as described above. The electronic device is configured by being pivotally supported by the motor.

  In the above configuration, when the movable casing 23 is closed with respect to the fixed casing 22, the opening / closing device 50 is shown in the cam operation diagram of FIG. 4A and the perspective view of the main part of FIG. The movable cam 37 is in elastic contact with the inclined portion on the right side of the reversing cam 44 protruding from the fixed cam 32 in the direction of the movable cam 37, and the movable body 36 is urged by the spring 41 in the closing direction in the right direction. A biasing force in the closing direction is applied to the movable casing 23 to which the movable case 39 is attached, and the movable casing 23 is held in a closed state.

  When the push button 24 on the side surface of the fixed housing 22 is pressed from this closed state, the push cam 47 of the push body 46 to which the push button 24 is attached pushes the release cam 45, and the release cam 45 causes the winding spring 48 to move. Since the release cam 45 is disengaged from the lower end of the reverse cam 44 while being bent, the reverse cam 44 moves downward.

  For this reason, as shown in FIG. 4B and FIG. 5B, the movable cam 37 biased by the spring 41 is elastically contacted with the left inclined portion of the fixed cam 32 and rotated to the left to move. Since the body 36 is biased in the opening direction in the left direction, a force in the opening direction is applied to the movable casing 23 by this force.

  Thereafter, as shown in FIGS. 4C and 5C, the movable cam 37 biased by the spring 41 does not elastically contact the left inclined portion of the reversing cam 44, not the fixed cam 32. Since it slides elastically on this and rotates to the left, the movable body 36 and the movable case 39 are also urged to open in the left direction during this time, and a force in the opening direction is applied to the movable casing 23. to continue.

  In a state where the movable casing 23 is opened and held with respect to the fixed casing 22 at a predetermined angle, for example, around 160 degrees, as shown in FIGS. The auxiliary cam 38 comes into elastic contact with the auxiliary cam 35 of the fixed case 34 and the movable body 36 stops rotating.

  At this time, when the finger is released from the push button 24 and the pressing force to the pressing body 46 is released, the pressing cam 47 moves, and the winding spring 48 is moved as shown in FIGS. 4 (e) and 5 (e). The release cam 45 urged by the rotation rotates leftward to press the reverse cam 44 upward, the reverse cam 44 moves upward and returns to the original position, and the release cam 45 and press cam 47 Will return to its original position.

  A separate stopper mechanism (not shown) or the like is provided between the movable casing 23 and the fixed casing 22, and it is easy to make a call using the voice input unit 22B or the voice output unit 23B. The movable casing 23 is stopped and held at an angle of.

  That is, in addition to opening and closing the movable casing 23 by hand, by pressing the pressing body 46, the release cam 45 is rotated and the reversing cam 44 is moved in the vertical direction, that is, in the axial direction. It is configured so that a so-called one-touch open operation that opens with one touch is possible.

  When the reversing cam 44 moves in the axial direction, the movable cam 37 is not the fixed cam 32 but the reversing cam 44 as shown in FIGS. 4C and 5C for a predetermined angle. Therefore, the fixed cam 32 is not required for the fixed body 31 during this rotation angle.

  That is, as shown in FIG. 2 and FIG. 3, the fixed cam 32 can be formed in a simple shape that partially protrudes outward rather than the entire circumference of the fixed body 31. Processing becomes unnecessary, and it becomes possible to manufacture the fixed body 31 at a low cost by a relatively easy method such as sintering molding processing or press processing, and by making the movable cam 37 elastically contact the reversing cam 44, A reliable opening and closing operation can be performed.

  As described above, according to the present embodiment, after the reversing cam 44 moves in the axial direction, the movable cam 37 formed to protrude from the inner periphery of the substantially ring-shaped movable body 36 is brought into elastic contact with the reversing cam 44. Since the movable cam 37 rotates elastically in contact with the reversing cam 44 during a predetermined angle, the fixed cam 32 is not required for the fixed body 31 during this rotation angle, and is fixed only to a part rather than the entire circumference. Since the fixed body 31 having the cam 32 can be formed, the fixed body 31 can be manufactured relatively easily by molding or the like, can be manufactured at low cost, and an opening / closing device with a reliable opening / closing operation can be obtained. It is something that can be done.

  Further, as described above, the auxiliary cam 35 and the auxiliary cam 38 that are elastically contacted when the movable casing 23 opens about 160 degrees with respect to the fixed casing 22 are formed on the outer periphery of the fixed case 34 and the movable body 36. As a result, the elastic contact torque of the movable body 36 urged by the spring 41 can be increased within a limited size, and the opening / closing operation can be performed more reliably, compared to the case where it is formed inward. .

(Embodiment 2)
Another embodiment of the present invention will be described using the second embodiment.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure of Embodiment 1, and detailed description is abbreviate | omitted.

  6 is a cross-sectional view of a switchgear according to a second embodiment of the present invention, FIG. 7 is an exploded perspective view of the same, and FIG. 8 is an exploded perspective view of the main part. In FIG. A pair of fixed cams 32 that protrude partially outward are formed on the outer periphery of the fixed body 31, the fixed body 31 is at the intermediate portion of the substantially cylindrical fixed shaft 53, and the fixed case 54 is at the left end. Each of them is fixed as in the case of the first embodiment, but no auxiliary cam is formed on the fixed case 54.

  A substantially ring-shaped metal movable body 56 is disposed so as to be rotatable in the opening / closing direction and movable in the axial direction with respect to the fixed body 31, and has a pair of pin-shaped movable cams 57 on the inner periphery. Is formed in the same manner as in the first embodiment, but no auxiliary cam is formed on the movable body 56.

  A pair of convex portions 56A protruding from the outer periphery of the movable body 56 are inserted into a pair of groove portions 39A provided on the outer periphery of the substantially cylindrical and metal movable case 39, so that the movable body 56 is axial with respect to the movable case 39. The fixed case 54 is rotatably attached to the left end opening of the movable case 39, and the fixed portion 54A is moved to the left. It is the same as in the case of the first embodiment.

  Further, the fixed shaft 53 is inserted into the movable case 39 and the right end is rotatably mounted on the outer surface of the movable case 39 by the retaining ring 40, or the coiled steel wire spring 41 is slightly bent. In this state, the movable body 56 is mounted between the right side surface of the movable body 56 and the inner side surface of the movable case 39, and the movable body 56 is biased toward the left fixed body 31 by the spring 41. This is the same as the case of 1.

  Further, a reversing body 62 and a releasing body 63 having a pair of concavo-convex reversing cams 64 and a releasing cam 65 formed at the right end, respectively, so that the reversing body 62 can move in the axial direction and the releasing body 63 can rotate. One end of the winding spring 68 that is attached to the fixed case 54 or slightly twisted is engaged with a pressing body 66 having a concave and convex pressing cam 67 formed at the right end, and the other end is engaged with a releasing body 63. Similarly to the case of the first embodiment, the pressing body 66 is attached to the left end of the fixed shaft 53 so as to be movable in the axial direction and protrudes leftward from the fixed case 54 while being stopped.

  A pair of concave auxiliary cams 71 are provided at the right end of the substantially cylindrical and metallic auxiliary body 70, and the auxiliary body 70 is fixed to the fixed case 54 to constitute an opening / closing device 75. Yes.

  In other words, in the present embodiment, by newly providing an auxiliary body 70 in which an auxiliary cam 71 is formed, the auxiliary case is not required for the fixed case 54 and the movable body 56, and these parts can be simply shaped. Can be configured.

  Then, the opening / closing device 75 configured as described above is fixed to the fixed case 54A of the fixed case 54 and the movable case 39 to the movable case 23, for example, as shown in the perspective view of FIG. At the same time, a push button 24 is attached to the pressing body 66, and the movable housing 23 is pivotally supported with respect to the fixed housing 22 by an opening / closing device 75 so that an electronic device is configured.

  In the above configuration, when the movable casing 23 is closed with respect to the fixed casing 22, the opening / closing device 75 is as shown in the cam operation diagram of FIG. 9A and the perspective view of the main part of FIG. The movable cam 57 is elastically contacted with the inclined portion on the right side of the reversing cam 64 protruding from the fixed cam 32 in the direction of the movable cam 57, and the movable body 56 is urged by the spring 41 in the closing direction in the right direction. A biasing force in the closing direction is applied to the movable casing 23 to which the movable case 39 is attached, and the movable casing 23 is held in a closed state.

  When the push button 24 on the side surface of the fixed housing 22 is pressed from this closed state, the pressing cam 67 of the pressing body 66 presses the release cam 65, and the release cam 65 deflects the winding spring 68 to the right. The release cam 65 is disengaged from the lower end of the reversing cam 64 and the reversing cam 64 moves downward as shown in FIGS. 9B and 10B, so that the movable cam urged by the spring 41 is moved. 57 is elastically contacted with the left inclined portion of the fixed cam 32 and rotates leftward, and the movable body 56 is urged to open in the leftward direction. Will be added.

  Thereafter, as shown in FIG. 9C and FIG. 10C, the movable cam 57 biased by the spring 41 is in elastic contact with the left inclined portion of the reversing cam 64 instead of the fixed cam 32. Since it slides elastically on this and rotates to the left, the movable body 56 and the movable case 39 are also urged to the left in the opening direction during this time, and a force in the opening direction is applied to the movable casing 23. to continue.

  In a state where the movable casing 23 is opened and held with respect to the fixed casing 22 at a predetermined angle, for example, around 160 degrees, as shown in FIGS. 9D and 10D, the movable cam 57 is The movable body 56 stops rotating by elastically contacting the auxiliary cam 71 of the auxiliary body 70.

  At this time, when the finger is released from the push button 24 and the pressing force to the pressing body 66 is released, the pressing cam 67 moves, and the winding spring 68 is moved as shown in FIGS. 9 (e) and 10 (e). The release cam 65 urged by the rotation rotates leftward to press the reverse cam 64 upward, the reverse cam 64 moves upward and returns to the original position, and the release cam 65 and press cam 67 are also moved. Will return to its original position.

  That is, in addition to the opening / closing operation of the movable casing 23 by hand, by pressing the pressing body 66, the release cam 65 is rotated and the reversing cam 64 is moved in the vertical direction, that is, in the axial direction. It is configured so that a so-called one-touch open operation that opens with one touch is possible.

  At this time, also in the present embodiment, when the reversing cam 64 moves in the axial direction, the movable cam 57 is not moved for a predetermined angle as shown in FIGS. 9C and 10C. As shown in FIG. 7 and FIG. 8, the fixed cam 32 is not required for the fixed body 31 during the rotation angle. Moreover, the fixed cam 32 can be formed in a simple shape that partially protrudes outward rather than the entire circumference of the fixed body 31.

  As described above, according to the present embodiment, after the reversing cam 64 moves in the axial direction, the movable cam 57 formed to protrude from the inner periphery of the movable body 56 is brought into elastic contact with the reversing cam 64, thereby Since the fixed body 31 can be formed with a fixed cam 32 only on a part of the circumference, the fixed body 31 can be manufactured relatively easily by molding or the like, and can be manufactured at low cost. It is possible to obtain an opening / closing device with reliable operation.

  Further, by providing the auxiliary body 70 in which the auxiliary cam 71 is formed, the auxiliary case is not required for the fixed case 54 and the movable body 56, so that these parts can be configured in a simple shape.

  Although the configuration is somewhat complicated, if the auxiliary body 70 is formed integrally with the fixed case 54, the switchgear can be configured at low cost without increasing the number of components.

  In the above description, the configuration in which the movable cams 37 and 57 are formed so as to be opposed to the inner circumference of the movable body 36 and 56 has been described, but a pair of movable cams are formed to project outward on the outer circumference of the movable body. The present invention can also be implemented by a configuration in which a fixed cam is formed on the inner periphery or the right end of the fixed body 31 and the movable cam and the fixed cam are elastically contacted.

  The switchgear according to the present invention can be manufactured at low cost, can be obtained with a reliable open / close operation, and is useful as a switchgear used in various electronic devices.

Sectional drawing of the switchgear by the 1st Embodiment of this invention Exploded perspective view Exploded perspective view of the main part Operation diagram of the cam Perspective view of the main part Sectional drawing of the switchgear by the 2nd Embodiment of this invention Exploded perspective view Exploded perspective view of the main part Operation diagram of the cam Perspective view of the main part Perspective view of mobile phone Cross-sectional view of a conventional switchgear Exploded perspective view Operation diagram of the cam

Explanation of symbols

22 fixed housing 22A operation unit 22B audio input unit 23 movable housing 23A display unit 23B audio output unit 24 push button 31 fixed body 32 fixed cam 33, 53 fixed shaft 34, 54 fixed case 34A, 54A fixed unit 35 auxiliary cam 36, 56 Movable body 36A, 56A Convex part 37, 57 Movable cam 38 Auxiliary cam 39 Movable case 39A Groove part 40 Retaining ring 41 Spring 42, 62 Reversed body 43, 63 Release body 44, 64 Reverse cam 45, 65 Release cam 46, 66 Press Body 47, 67 Press cam 48, 68 Winding spring 50, 75 Opening / closing device 70 Auxiliary body 71 Auxiliary cam

Claims (1)

A substantially cylindrical fixed body provided with a fixed cam on the outer periphery, inner periphery or end, and arranged so as to be rotatable in an opening direction or a closed direction with respect to the fixed body, and a movable cam protrudes on the inner periphery or the outer periphery. A substantially ring-shaped movable body that is formed, a spring that biases the movable cam in the direction of the fixed cam, and an axially movable body, and a reversing cam is formed on the surface facing the movable cam. A direction in which the reversing cam is separated from the movable body when the movable cam is elastically contacted with the reversing cam and the movable body is biased in the closing direction by the spring. moving then, the movable cam is in elastic contact with the fixed cam, the movable body is rotated is biased in the opening direction, thereafter, the movable cam is elastic contact with the reversing cam, the movable body above during the predetermined angle in the opening direction, rotates Closing device.

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